ALEXANDRIA, Va., Dec. 31 -- United States Patent no. 12,510,423, issued on Dec. 30, was assigned to TTI Co. LTD. (Suwon-si, South Korea).
"Time temperature indication module" was invented by Ji Hoon Park (Yongin-si, South Korea) and Bong Soo Kwon (Gunpo-si, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a time-temperature indicating module that causes a spread material whose degree of diffusion changes with temperature change to be absorbed and diffused into a diffusion material through induction of a crack, guides a diffusion direction of the spread material through a guide line printed in a longitudinal direction of the diffusion material and also enables a clea...